Poker's a day to learn and a lifetime to master.

The line frames poker as a discipline with a low barrier to entry but an exceptionally high skill ceiling. It contrasts the quick acquisition of rules and basic strategy (“a day to learn”) with the long-term, iterative refinement required to excel (“a lifetime to master”). Implicitly, it points to poker’s layered complexity: probability and game theory, psychological reading, bankroll management, and adapting to changing opponents and formats. The aphorism also functions as a caution against overconfidence—knowing how to play is not the same as playing well—and as a celebration of poker’s enduring appeal as a game where learning never truly ends.